Make your dungeon in Minecraft.. Start a server.. Your friends log into your sever.. Begin play with your 3d Map!

I wonder if that would work? Especially if you had some laptops and could all just hook to the server via the LAN capabilities added to Minecraft.. There's some obvious hiccups.. Might be hard to to figure out how many blocks to go, but I don't think that'd be much of a problem.. Plus everyone has to have Minecraft to make it work.. Putting where monsters are might be difficult as well.. Could be an interesting thing to try..

I'm really liking the idea of using a 3D printer to make maps now. Even without MineCraft, I could make the rooms with the printer then add perforated areas so I can break it up and toss it into a filabot when I am done!

Also, good idea on the server thing. But IDK if my group would be up for that, we like maps. Also, the use of custom graphic skins would help clarify the block/grid issue. Adding a border to the edge of a cube for example.